fbdev: sh_mobile_lcdc: Constify sh_mobile_lcdc_fix structure

The structure is only read, make it const.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
diff --git a/drivers/video/sh_mobile_lcdcfb.c b/drivers/video/sh_mobile_lcdcfb.c
index e672698..5461abe 100644
--- a/drivers/video/sh_mobile_lcdcfb.c
+++ b/drivers/video/sh_mobile_lcdcfb.c
@@ -1003,7 +1003,7 @@
 	return 0;
 }
 
-static struct fb_fix_screeninfo sh_mobile_lcdc_fix  = {
+static const struct fb_fix_screeninfo sh_mobile_lcdc_fix  = {
 	.id =		"SH Mobile LCDC",
 	.type =		FB_TYPE_PACKED_PIXELS,
 	.visual =	FB_VISUAL_TRUECOLOR,